This is actually not half bad! Simplistic and yet it looks nice, its easy on the eyes, has good compo, depth, and the beginnings of really interesting effects. Text shouldn't be shoved in a corner like that, put it close to the render and a little smaller, with default fonts - my favorite is century gothic.
You need a light source, try putting a little visible light coming from behind the render with a 100px soft brush or so.
You've still got a ways to go, but you've definitely got the basics down, follow some tuts and you'll get everything in no time.